ARM:dts:msm Add ADC_TM node, channels and thermal zones on QCS405

Add ADC_TM node and channels and corresponding user thermal zone
entries on PMS405 on QCS405.
In addition, add iio labels to VADC node.

Change-Id: Iffa5e78882d10eefc754f6c576c0bfa5e6aa2ce8
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>